Right, here's some context. I have a large amount of metal shavings from a dozen different sources, and they are very light and sharp. Some of them aren't, but most of them are. I need to dispose of them without ruining the day of an unlucky employee at a recycling plant. So I intend to melt them into easily organized and transportable ingots.
The only problem is, I also want to learn how to make an induction heater, and all of those metal shavings sound like perfect test subject for this project.
Now, when it comes to making an induction heater, my research has informed me that I need a Tank Capacitor hooked up to an oscillating power supply. The Tank Capacitor part sounds simple enough, I have serviceable capacitors for days, and I have copper pipe from a plumbing project that went nowhere, for the work coil.
The project got complicated when the concept of resonance got introduced. A quick wiki-crawl and an examination of several similar projects revealed that a Tank Capacitor has a specific resonance frequency, where the energy gain (Transfer? Whatever.) is at it's most efficient. The equation can be found with a quick google. However, the inductance, one of the variables used to determine the resonance frequency, changes based on the contents of the work coil. I have been led to believe that it also changes based on how hot the work piece is.
So I have to ask, how do I determine the resonant frequency while the work coil is functioning? Can I just attach a wire to the Tank Capacitor to determine the frequency that its oscillating at, and get the resonant frequency from that?